Error: main class not found

Question

When compiling the program I get the error as

Could not find the main class: Solution. Program will exit.

The program is:

import java.util.*;

public class Solution{
   public static long[] factors(long a){
     long[] b;
     b=new long[50];
     int count=0;
     for(long i=1L;i<=a/2;i++)
       if(a%i==0) b[count++]=i;
     return b;
   }

   public static void main(String[] args) {

        Scanner in=new Scanner(System.in);

        int N=in.nextInt();
        long K=in.nextInt();
        long[] fact=factors(K);
        l1:
        for(int i=0;i<N;i++)
        {
            long num=in.nextInt();
            for(int j=0;j<fact.length;j++)
                if(num%fact[j]==0 && fact[j]!=1) {fact[j]=1;continue l1;}

        }
        int result=0;
        for(int i=0;i<fact.length;i++)
            if(fact[i]!=1) ++result;
        System.out.println(result);
    }
}

Answer 1

This will not compile because the main method is not belong to a class. Put the main method inside the class to solve the problem. And your code is throwing arithmetic exception divide by zero should be fixed like that.

for(int j=0;j<fact.length;j++)
  if (fact[j] != 0)
    if(num%fact[j]==0 && fact[j]!=1) {
      fact[j]=1;continue l1;
    }